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Hemochromatosis gene mutations in chronic hepatitis C patients with and without liver siderosis
F Negro1, K Samii, L Rubbia-Brandt
1Divisions of Gastroenterology and Hepatology, University Hospital, Geneva. Francesco.Negro@dim.hcuge.ch
Insights
Hepatitis C patients often have liver iron overload, but common hemochromatosis (HFE) gene mutations do not fully explain this iron accumulation. Further research is needed to understand the exact cause of iron overload in chronic hepatitis C.
Area of Science:
- Hepatology
- Genetics
- Virology
Background:
- Chronic hepatitis C (HCV) is frequently linked to hepatic iron overload.
- Iron overload can negatively impact patient prognosis and antiviral treatment efficacy.
- The role of hemochromatosis (HFE) gene mutations in HCV-associated iron overload is not fully understood.
Purpose of the Study:
- To investigate the prevalence of HFE gene mutations (C282Y and H63D) in chronic hepatitis C patients.
- To determine if HFE mutations contribute to liver iron overload in this population.
- To correlate iron levels with clinical, histological, and virological features of chronic hepatitis C.
Main Methods:
- Studied 120 chronic hepatitis C patients.
- Assessed hepatic iron semiquantitatively using a hepatic iron index.
- Measured serum and liver HCV RNA levels and determined HCV genotype.
- Genotyped for HFE C282Y and H63D mutations.
Main Results:
- 30% of patients exhibited excess liver iron (siderosis).
- Siderotic patients were older, more often male, less frequently infected with HCV genotype 3, and had higher fibrosis scores.
- No significant difference in HFE mutation frequency or HCV RNA levels between siderotic and non-siderotic patients.
- Liver iron content did not correlate with HCV RNA titers.
- 10 patients with siderosis had no identified risk factors including HFE mutations.
Conclusions:
- HFE gene mutations do not fully account for liver iron overload in chronic hepatitis C patients.
- The underlying mechanisms driving iron accumulation in these patients remain unclear.
- Further investigation is required to elucidate the pathogenesis of hepatic siderosis in chronic hepatitis C.
Abstract:
Chronic hepatitis C is often associated with liver iron overload, which may affect the long-term prognosis and the response to antiviral treatment. The occurrence of hemochromatosis (HFE) mutations were studied to determine whether may contribute to the liver iron overload of chronic hepatitis C patients. The prevalence of two HFE mutations (C282Y and H63D) in 120 chronic hepatitis C patients was determined and the findings were correlated with clinical, histological and virological features. Hepatic iron was determined semiquantitatively by a histochemical hepatic iron index, defined as the ratio of a histochemical staining score to the patient's age, after correction for heterogeneous lobular iron distribution. Serum hepatitis C virus (HCV) RNA was measured by bDNA assay and typed by restriction fragment length polymorphism. Liver HCV RNA was measured by a semi-quantitative strand-specific reverse transcription-polymerase chain reaction (RT-PCR). Excess liver iron was stained in the liver of 36 patients (30%). Siderotic patients had the same geographic origin, serum and liver HCV RNA levels and H63D and C282Y mutations frequency as non-siderotic patients. However, siderotic patients were older (P = 0.015), more frequently males (P = 0.02), less frequently infected with HCV genotype 3 (P = 0.037) and had a higher liver fibrosis score (P = 0.008). The liver iron content did not correlate with the serum or liver HCV RNA titers. Ten of the 36 patients with liver siderosis had neither a history of excess alcohol intake, multiple transfusions, or HFE mutations. In conclusion, the pathogenesis of the liver iron overload in chronic hepatitis C patients cannot be fully explained by the occurrence of HFE mutations. The exact mechanism of iron accumulation in these patients therefore remains unexplained.